how is the wifi measured?

[uhh3234]

i switched the wifi in my sb settings to numeric and cant understand what the digits represent. at first i forgot i did this and thought it was temperature

it is usually -20 to -40 and when place my iphone on the antenna of my router, it goes as high as +8 and hovers around 3 to -10.

tried to search this but got super random threads.

 

[flyingember]

that's in decibles